Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0942758ff020b9fcc5b1d0ce128c2becdd38f79c314e6ca53b78cdd9be209614' 
  AND token = '9TB2Zxmfid7gem9g+8A8UR9NaZoWbAM++r7q/GZyBl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}